Malicious PDF — malware analysis report

Static analysis result for SHA-256 70b3f052ea5cedb1…

MALICIOUS

PDF

77.8 KB Created: 2021-03-17 19:31:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: d4e4a439131afc67a3dcebb988480e7f SHA-1: 9a17b0884c6a2503fa1b826a87121bf94019d2e0 SHA-256: 70b3f052ea5cedb131628ccdbf3392e96669c8b3becde6ea04d2c60fc5c6c61d
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://druttle.ru/strik?utm_term=what+is+a+research+instrument+definition PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4489615/normal_5fe5ba43ed993.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4380083/normal_5fcd3ea2cc7f8.pdfIn PDF document text
    • https://kibanelamuvudu.weebly.com/uploads/1/3/0/9/130969844/kudiro-favejovixo-mexikepumov-vodojub.pdfIn PDF document text
    • https://dotomogef.weebly.com/uploads/1/3/4/7/134760479/6622483.pdfIn PDF document text
    • https://jurivulanikep.weebly.com/uploads/1/3/4/5/134525456/8072860.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393188/normal_5fd02e6a16275.pdfIn PDF document text
    • https://tinuwese.weebly.com/uploads/1/3/5/3/135300683/bedobatorutovil.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501198/normal_603f31fc30767.pdfIn PDF document text
    • https://bufagigakumeg.weebly.com/uploads/1/3/4/3/134313452/binerati-luwajifajakax-zagola.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4466673/normal_6037efd2533b5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393908/normal_600bbaf210aa6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4461498/normal_60316a5990f11.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383689/normal_5fcd7dd1b6ee3.pdfIn PDF document text
    • https://puzejiwitamino.weebly.com/uploads/1/3/1/4/131453698/tixififuz_doxugeguka_wojixiselu_xaxizifun.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370266/normal_601a38612fd2e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450038/normal_603f13da381bf.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4475406/normal_6008652ee8956.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4406454/normal_603aebd5e21e0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381101/normal_6024c44b1cad9.pdfIn PDF document text
    • https://jegofedakosufe.weebly.com/uploads/1/3/5/3/135320490/folan.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://fb79ad55-22b5-4823-9538-35c71bbbd514.filesusr.com/ugd/ea423f_5d842450f95b4b33ba739706084896d5.pdf?index=trueIn PDF document text
    • https://b23183eb-b2e5-455e-bc25-91fac1efd10f.filesusr.com/ugd/cc14e4_c30694f0ef74406cb78b546ee72f82b9.pdf?index=trueIn PDF document text
    • https://3c3b7999-3797-4e53-a1d2-7989294d2e96.filesusr.com/ugd/cac9e4_5b966f45954e42b2a41841c46d1f7ff6.pdf?index=trueIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f296.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF296 5244 bytes
SHA-256: be9441ee40a80267a65844fd7b0247cbcc76aace4ba407a6be13e0ab6ec09708
font_01_sfnt_off0001044c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1044C 10980 bytes
SHA-256: b341ea5dd8d39d8e375843a44724221213d7938f691cf8dfe11b1095e63b6716